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Nonwoven composite including an apertured elastic film and method of making

a technology of elastic film and nonwoven composite, which is applied in the direction of synthetic resin layered products, other domestic articles, bandages, etc., can solve the problems of uncomfortable and unpleasant against the wearer's skin

Inactive Publication Date: 2011-06-30
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0002]In accordance with one embodiment of the present invention, a method of forming a nonwoven composite is disclosed. The method comprises forming an elastic film from a polymer composition on a nonwoven web material to form a film/nonwoven composite, stretching the film/nonwoven composite at a stretch ratio of about 1.5 or more, and passing the film/nonwoven composite through a nip formed by at least one patterned roll. At the nip, the film and the nonwoven we...

Problems solved by technology

Unfortunately, elastic films often have unpleasant tactile aesthetic properties, such as feeling rubbery or tacky to the touch, making them unpleasant and uncomfortable against the wearer's skin.

Method used

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  • Nonwoven composite including an apertured elastic film and method of making
  • Nonwoven composite including an apertured elastic film and method of making
  • Nonwoven composite including an apertured elastic film and method of making

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[0091]The ability to form an apertured elastic nonwoven composite was demonstrated at a number of different processing conditions. The film used in the composite contained approximately 90-95 wt % of an elastomer composition and 5-10 wt % of a thermoplastic composition as a skin layer. The elastomer composition contained 48 wt % KRATON® MD6716 (Kraton Polymers, LLC of Houston Tex.), 48 wt % KRATON® MD6673 (Kraton Polymers, LLC), and 4 wt % SCC 4837 (“Standridge Color Corporation, Social Circle, Ga.). KRATON® MD6716 contains approximately 75 wt % of a styrene-ethylene-butylene-styrene (“SEBS”) block copolymer, tackifier, and polyethylene wax, and has a target melt flow rate of 7 g / 10 min (200° C., 5 kg). KRATON® MD6673 contains 68 wt % of a styrene-ethylene-butylene-styrene block copolymer (KRATON® MD6937), 20 wt % REGALREZ™ 1126 (Eastman Chemical) and 12 wt % EPOLENE™ C-10 polyethylene wax (Eastman Chemical). SCC 4837 is a pigment containing titanium dioxide blended with polyethylen...

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Abstract

An elastic nonwoven composite that contains an elastic film laminated to one or more nonwoven web materials is provided. The composite is formed by passing an extrusion-coated film / nonwoven laminate through a nip to create apertures through both the film and the nonwoven. The apertures are of a size sufficient to provide a desired level of texture, softness, hand feel, and / or aesthetic appeal to the composite without having a significant adverse effect on its elastic properties. Apertures are accomplished in the present invention by selectively controlling certain parameters of the lamination process, such as film content, element pattern, degree of film tension, temperature and pressure conditions, and so forth.

Description

BACKGROUND OF THE INVENTION[0001]Elastic composites are commonly incorporated into products (e.g., diapers, training pants, garments, etc.) to improve their ability to better fit the contours of the body. For example, the elastic composite may be formed from an elastic film and one or more nonwoven web materials. The elastic film may be coextruded onto the nonwoven web material to allow the use of particularly lightweight nonwoven materials. The resulting elastic composite is stretchable to the extent that the nonwoven web material is extensible. Unfortunately, elastic films often have unpleasant tactile aesthetic properties, such as feeling rubbery or tacky to the touch, making them unpleasant and uncomfortable against the wearer's skin. In an effort to improve the properties of elastic films, the films may be apertured. However, a need remains for improvement in methods of aperturing elastic film / nonwoven composites after formation of the composite material.SUMMARY OF THE INVENTIO...

Claims

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Application Information

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IPC IPC(8): A61F13/53B32B38/00B32B38/04B32B3/24
CPCA61F13/15593A61F13/4902B32B3/266B32B5/022B32B27/12B32B37/153Y10T428/24322B32B2038/0028B32B2038/047B32B2274/00B32B2305/20B32B2307/51B32B2555/02B32B38/04
Inventor WELCH, HOWARD M.RHODES, GLENDA J.HUANG, LEILAKE, MATTHEW B.NG, WING-CHAKREDHEAD, AKWOKWO H.DE SIQUEIRA, JOSE AUGUSTO VIDALTHOMAS, OOMMAN P.
Owner KIMBERLY-CLARK WORLDWIDE INC
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